We got there at nine o＇clock. Mr Zhu divided us into three groups and then we began working.

　　the students in Group One planted trees and watered flowers. the studentsin Group Two were busy collecting litter left by the tourist. they also cleaned the benches in the park. I was in Group Three. We went to the children＇s playground and cleaned all the equipment there. We worked very hard.

　　At about eleven we finished working. We met at the gate of the park. We all felt tired but very happy.